package imp4;

public class Singleton
{
    private volatile static Singleton uniqueInstance;

    private Singleton()
    {
    }

    public static Singleton getUniqueInstance()
    {
        if (uniqueInstance == null) {
            synchronized (Singleton.class) {
                if (uniqueInstance == null) {
                    uniqueInstance = new Singleton();
                }
            }
        }
        return uniqueInstance;
    }
}